An overhaul kit contains a set of gaskets, O-rings, vanes, bearing, bearing sleeves, shaft seals and taper
pins. Please consult Airtech Inc. parts department for information.
4.0 PROBLEM SOLVING
4.1 Problem
Pump does not reach end pressure. This is the lower absolute (best vacuum) when running with the inlet closed.
4.1.1 Possible Cause
Oil condition is most often the cause of not reaching end vacuum.
Remedy: drain oil from pump and refill with fresh oil. Run pump with fresh oil for 15 minutes then
take new pressure reading.
4.1.2 Possible Cause
Inlet screen clogged with debris.
Remedy: clean screen and check inlet filter element.
4.1.3 Possible Cause Shaft
seal leak.
Remedy: replace shaft seal, from overhaul kit, or call Airtech for exchange program.
4.1.4 Possible Cause
Vane stuck in rotor slot.
Remedy: drain oil with flushing oil. Run pump for 15 minutes and drain. Replace fluid with fresh oil, exhaust
filter, and spin on filter. Replace vane from overhaul kit; call Airtech for exchange program
4.1.5 Possible Cause
Anti-suck back valve stuck in closed position due to oil contamination.
Remedy: disassemble valve and screen, clean as required. Drain old oil and replace with fresh oil.
4.1.6 Possible Cause
No oil or low oil level in reservoir.
Remedy: shut down pump, drain balance of oil and refill with fresh oil.
4.1.7 Possible Cause
Vacuum fitting or hose is not leak tight.
Remedy: check hose and pipe connections for leaks.
4.1.8 Possible Cause
Radial clearance between rotor and cylinder are no longer adequate.
Remedy: overhaul pump or call Airtech Inc. for exchange program.
4.2 Problem
Pump runs very noisy.
4.2.1 Possible Cause
Coupling insert is worn.
Remedy: replace coupling insert in motor/pump coupling.
4.2.2 Possible Cause Vanes
stuck
Remedy: follow flush procedure from 4.1.4 or replace vane or call Airtech Inc. for exchange
program.
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